json - Override how Data.Aeson handles only one field of my record -

-

I am making a REST API for university courses: 

  data course = course Examples of JSN course from example ID: may be text, name :: text, deleted :: boom} deriving (show, generic), tojson course   
 I deleted Gone   to be optional in the chain JSON structure, but not in my application. I want to set  to be incorrect  to  incorrect , if it is not specified during parsing.  
 I can write a manual example for  FromJSON , but I do not want to write it for all areas. I want to declare how removable methods are handled and automatically handle everything in the example.  
 How do I do this?   
 
 
 There is no way for my knowledge to adapt the general example, Make a slightly different way:  
  data course = course {courseId :: probably text - do not use 'id', it's already a function, name: text} Derivating (Show, Generic) Data Removable A = Delayable {Deleted: Bull, Item :: A} Deriving (example) example from JSN Cor Example ToJSON Jejesoan A = example of course gt; From JSON (deletable) where parseJSON (object v) = I IT & lt; - parseJSON (object v) D & lt; V.:? "stripped of".! = Deleting incorrect return $ D. I can parseJSON _ = major   
 now you can  
  & gt; No deleted = "{\" name \ ": \" Math \ ", \" courseId \ ": \" 12345 \ "}: :: text & gt; Withdeleted =" {\ "name \": \ "Math \ "," "Deleted", "Deleted": True "" Text: "Decode No Delitated :: Probably (Dletable Course) Bus (Delayable) {deleted = false, items = Course {CourseID = Just "12345", name = "Math"}}) Decode No Delayed: Perhaps Course Just (Course {CourseID = Bus "12345", Name = "Math"}); Decoding With Delayed :: Probably (Dellette Course) Bus (Delayable) {Deleted = True, Item = Course {Course Id = Just "12345", Name = "Math"}}) Jr. Decode :: Maybe Course Just (Course {CourseIID = just "12345", name = "Math"})   
 And now you alternatively choose a course as a tag for DelTable You can tag it when you need it, and  FromJSON  examples take care of everyone.

Comments

Post a Comment

Popular posts from this blog

php - PDO bindParam() fatal error -

-
I am trying to learn PDO, now I have written this small code, but it gives me a serious error: < P> Fatal error: Call a member function at a non-object dot () ... $ con = new mysqli ("127.0.0.1", "root", "", "csvdangercheck"); $ Query = $ con- & gt; ("Id,` var1`, `var2`) values ​​(" id,: var1,: var2) ";); $ query- & gt; bypass pattern (': id', $ id); $ query- & gt; BindParam (': var1', $ VAL1); $ Query- & gt; bindParam (': var2', $ val2); $ Query-> Executed (); I Trying to use print_r ($ con-> errorInfo ()) but Fatal error: Undefined method mysqli :: errorInfo ( ) ... can someone tell me what am I missing? Flaffeh said, you have PDO Missing Mysqy, try it: $ con = new PDO ('mysql: host = 127.0.0.1; dbname = csvdangercheck', 'root', '');
Read more

logging - How can I log both the Request.InputStream and Response.OutputStream traffic in my ASP.NET MVC3 Application for specific Actions? -

-
For a specific set of tasks, I need to log in to the incoming request inputstream as well as outgoing response. is. I am using an ActionFilterAttribute for this and overriding the OnActionExecuted and OnResultExecuted methods. So I'm starting with this idea ... Public category ActionLoggerAttribute: ActionFilterArrbit {Public Override Zero On-Offed Execution (ActionActioned Contact Filter Filter) {base.OnActionAxecuted (FilterContext); HttpRequestBase request = filterContext.HttpContext.Request; // TODO: Log the request. InputStream} Public Override Zero OnResultExecuted (ResultExecutedContext FilterContext) {base.OnResultExecuted (filterContext); HTTPRPSPointBase Response = FilterContacts Hpptex response; // TODO: Log on Response.OutputStream}} Ideally I'll hook it up with enterprise library logging because I'm already using it for error logging. Am I reaching the input and output stream at the right time? Can I easily use the Enterprise Library to log i
Read more

java - Why my included JSP file won't get processed correctly? -

-
I am trying to create Java web framework (and learning), and on the basis of 'Code Generator In the process of making the material view of the database in the process of development, I stumbled into a difficulty, which I do not know how to solve it. First of all, I want the following index.jsp : & lt; Body & gt; Use all pages to be created. & Lt;% @ include file = "header.jsp"% & gt; & Lt; Hours / & gt; & Lt;% @ included file = "body.jsp"%> & Lt; Hours / & gt; & Lt;% @ include file = "footer.jsp"% & gt; & Lt; / Body & gt; And, in body.jsp , I should have it like this: & lt; Jsp: include page = "$ {Application_modul}"%> Where application_modul is an attribute defined in its controller: request.setAttribute ("application_modul", "USER_ACCOUNT \\ ' View_user_account.jsp "); This file can be found properly, but the processed JSP does
Read more